Regional Research Station, ICAR-Directorate of Groundnut Research, Anantapur
1ICAR-National Bureau of Plant Genetic Resources, New Delhi, 110 012
2ICAR-Indian Institute of Rice Research, Hyderabad
3ICAR-Directorate of Groundnut Research, Junagadh, Gujarat
4ICAR-Indian Institute of Wheat and Barley Research, PB No. 158, Karnal, 132 00
5ICAR-Indian Institute of Maize Research, Ludhiana, Punjab
Additive main effects and multiplicative interaction (AMMI) analysis is widely used for analyzing data of multienvironment trials (METs) to model the genotype-byenvironment interactions (GEIs). However, AMMI model do not rank genotypes which is required for aiding selection. In order to overcome these lacunae a stability index titled AMMI stability value (ASV) was proposed by Purchase et al. (1997) using first two interaction principal components (IPCA) from the results of AMMI analysis. Later, Zali et al. (2012) modified it and proposed Modified ASV (MASV) which used all significant IPCAs. However, Zali et al. (2012) read the original formula of ASV incorrectly while proposing MASV thus rendering it erroneous. Use of this erroneous MASV impacted genotype ranking significantly. Corrected version of MASV, i.e. MASV2 showed significant correlation with other stability models. Hence, we propose MASV2 as a correct formula for modified AMMI stability Value (MASV) and this correct version of MASV may be used instead of earlier formula proposed by Zali et al. (2012)
AMMI, ASV, GEI, MASV, stability
